<iframe width="580" height="385" src="https://www.youtube.com/embed/SkTvdPpGCXw" frameborder="0" allowfullscreen></iframe> <br>Ha Long Bay in Vietnam is a world-famous natural wonder, with more than a thousand limestone islands. Ha Long Bay is Vietnam's paradise and is the number ... <br><a href="https://www.youtube.com/watch?v=SkTvdPpGCXw">source</a>